Clustering of 4C radio sources

Details Clustering of 4C radio sources Clustering of 4C radio sources

Jan 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.194..251s&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 194, Jan. 1981, p. 251-260. NSF-supported research.

Astronomy and Astrophysics

Astronomy

9

Galactic Clusters, Radiation Distribution, Radio Sources (Astronomy), Computerized Simulation, Correlation, Red Shift, Statistical Distributions

Scientific paper

The correlation among angular positions of sources in the 4C catalog is discussed. Numerical model catalogs are used to estimate the effects of confusion and of the zones of incompleteness around intense sources. The source positions are found to be anticorrelated at separations in the range 5-30 deg. It is argued that this is a result of the systematic variation of the density of sources with declination, an effect presumed to be an artefact of the way the data were taken. There is weak but apparently significant evidence of clustering of sources in scales theta = 1.5-3 deg. It is concluded that this is not due to any of the several possible sources of bias examined. The cross-correlation of 4C source positions with positions of those 4C galaxies with known redshifts suggests that the clustering is among sources at redshifts less than approximately 0.1 and flux levels greater than approximately 3 Jy.

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